Pendulum for clocks



Oct. 19 1926,.

R. THORMANN PENDULUM FOR CLOCKS Filed Oct. 28, 1925 /h ve'n/or: )Pada/f nor-man Patented Oct. 19, 1926.

' UNITED STATES 1,603,422 PATE T QFFICELH RUDOLF THORMANN, OF COETHEN-ANI-IALT, GERMANY.

PENDULUM FOR CLOCKS.

Application filed October 28, 1925, Seria1 No. 65,387, and in Germany October 23, 1924.

of the pendulum rod can be correctly set with regards to the correct time keeping of the clock.

It is one of the objects of my lnvention to thus design said mechanism that the.

weight will automatically and positively follow every movement-even the slightestupwards or downwards-of the adjusting member.

Another object of my invention is toeliminate the efiects of wear at the faces where the adjusting member and the weight are in contact. It is a fact known among expert watch makers that even said faces will wear off in course of time, which notlceably interferes with the correct time keepiAnother object of my invention is to positively prevent any unsetting of the correctly set pendulum weight due to vibrations and shocks to which the clocks are frequently subjected through passing trains, trolley cars, heavy machinery, etc. at work nearby, and last but not least due to shocks occurring in the course of transportation from manufacturer to seller and buyer.

It has been proved by experience in many cases that vibrations and shocks will cause the mostly unlocked set-screws or threaded nuts at the lower end of clock pendulums to turn little by little, thereby gravely interfering with the correct time keeping of the clock.

With these and other objects in view I have designed an improved mechanism for adjusting and setting the weight of clock pendulums, the essential features of which have been briefly set forth in the appended claims.

The nature of this invention and the scope of my claims will be more fully understood from the following specifications taken together with the accompanying drawing in whichv Fig. 1 is a view of a clock pendulum from the rear,

Fig. 2 is a side view and a plan of the pendulum and the clamping device respectively,

Fig. 3 shows the pendulum with a modification of the clamping device,

F igs.4 and 5, are rear and side elevations of the pendulum weight with clamping devices of different design. i Y

a designates the pendulum rod to the lower end of which the weight or bob Z) is attached. In the embodiment of my in vention, illustrated in the drawing, the said weights Z) are shown'as being made in the form of hollow lens-shaped discs, but the specific form and design of the weight per se is by no means an essential feature of my invention and not intimately correlated therewith.

The weight b is preferably in slight frictional contact with the rod a, e. g. by means of a resilient tongue formed by two slots 2', 2' at the rear face of the weight.

At its lower end the rod (1 is provided with V a threaded wire 0, carrying a nut (Z and serving as weight setting mechanism.

According to my invention the nut cl is clamped to the weight preferably by resilient clamping means so as to positively control the upward and downward shifting of the weight b.

In the modification shown in Figs. 1 and 2 by way of an example, the clamping means comprises a V-shaped metal wire, the legs f of which at g engage by means of hooks. 1

slots 2', z' in the rear face 6 and have waved resilient sections f.

At its lower end of the clamping member an eye 70 is formed, so as to engage the nut cl from underneath.

The nut (Z positions the weight b by means of an intermediary member e, adapted to contact with the periphery of weight b.

In the modification, shown in Fig. 3, the clamping member consists of a wire Z having a waved section Z and engaging the weight Z) by means of a hook at 0.

In the modified form, shown in Fig. 4, the clamping wire m has a resilient section, represented by a helical spring 02, and it engages the front face of the weight by means of a hook p.

In the modification shown in F ig. 5 the clamping member@ engages the nut d by means of an interposed spring 8. I

In all the modifications shown the clamping wire at its lower end is formed with an eye portion 70 surrounding the threaded bolt 0 and engaging the nut d from underneath.

lVhat I claim is 1. In a pendulum for clocks, a rod having a lower threaded end, a hollow weight having a pair of downwardly extending slots forming a spring ,tongue adapted to friotionally engage the rod, a nut having a seat for the weight threaded upon the rod, an d a tensioning member having one portion thereof engaging the upper portionof the weight and its opposite end engaging the lower face of said nut.

2. In a pendulum for clocks, a rod having a lower-threaded end, a hollow weight having a pair ofdownwardly diverging slots forming a spring tongue adapted to frictionallyengage therod, a nut havinga seat for the weight threaded upon the rod, and a tensioni'ng member havinga pair of upwardly diverging. arms engaging thelower a lower threaded end,

ends of the slots and an intermediate por-v tion engaging the under face of the nut.

In testlmony whereof I have signedrmy name to this specification.

RUDOLE THORMANN. 

